并行工程纺机设计平台的建立

介绍了基于PDM的并行工程纺机设计平台的建立情况，其中包括了三维CAD／CAM／CAE在纺机产品开发过程中的应用现状，CAPP在工艺编制中的应用，宏源公司PDM项目的技术特点、创新之处。讨论了PDM和ERP的集成问题。     

Profile of urinary and fecal proanthocyanidin metabolites from common cinnamon (Cinnamomum zeylanicum L.) in rats

Cinnamon (Cinnamomum zeylanicum L.) bark is widely used as a spice and in traditional medicine. Its oligomeric and polymeric proanthocyanidins are believed to be partly responsible for the beneficial properties of the plant. We describe here the metabolic fate of cinnamon proanthocyanidins in the urine and feces of rats fed a suspension of the whole bark. The metabolites include ten mono‐, di‐, and tri‐ conjugated (epi)catechin phase II metabolites and more than 20 small phenolic acids from intestinal microbial fermentation. Some of these are sulfated conjugates. Feces contain intact (epi)catechin and dimers. This suggests that free radical scavenging species are in contact with the intestinal walls for hours after ingestion of cinnamon. The phenolic metabolite profile of cinnamon bark in urine is consistent with a mixture of proanthocyanidins that are depolymerized into their constitutive (epi)catechin units as well as cleaved into smaller phenolic acids during their transit along the intestinal tract, with subsequent absorption and conjugation into bioavailable metabolites.     

Application of aerosol‐spray deposition for determination of fine structure of barley starch using atomic force microscopy

Starch samples extracted from barley cultivars with varying AM concentrations were imaged by AFM using intermittent contact mode. Two different deposition methods were used: a simple solution drop and an aerosol spray deposition. Using the drop deposition method, starch appeared mainly as small particles and aggregated globules, with average heights of 1.8 ± 0.2, 2.7 ± 0.7, and 5.5 ± 1.0 nm, for starch solutions containing increased (38%), normal (25.8%), and undetectable (0%) AM, respectively. The aerosol spray deposition method allowed analysis of individual biopolymer chains of AM and biopolymer fibrils of AP. The image of normal starch showed individual AM chains with an average height of 0.8 ± 0.2 nm, and an average contour length of 178 ± 127 nm. For increased AM starch, the height of individual AM chains was similar to normal starch, but the average contour length was shorter (140 ± 70 nm). All barley starches showed fibril bundles of AP with average heights of 1.9 to 2.9 nm and lengths in the micron size range.     

Role of intestinal microflora in xenobiotic‐induced toxicity

In addition to its role in digestion of food in the gastrointestinal tract, the intestinal microflora is also capable of biotransforming numerous drugs. Likewise, the intestinal microflora may significantly modulate xenobiotic‐induced toxicity by either activating or inactivating xenobiotics via metabolism. To date, most investigations of xenobiotic metabolism have focused not only on metabolism in host tissues, but the modulation of the pharmacological activity of drugs by the intestinal microflora. Despite its importance, the presumed role of intestinal microflora metabolism in xenobiotic‐induced toxicity has been understudied. Therefore, it is appropriate to briefly review our current situation, and state which research in xenobiotic metabolism by intestinal microflora, particularly in the field of toxicology, is needed.     

采用LC/MS/MS测定侧流卷烟烟气中挥发性羰基化合物的方法研究

挥发性羰基化合物是卷烟烟气中的一类重要有害物质,准确测定卷烟烟气中,特别是侧流卷烟烟气中的挥发性羰基化合物还有许多问题有待解决。实验中采用2,4-二硝基苯肼（DNPH）酸性溶液捕集侧流烟气中的羰基化合物,乙腈水溶液稀释后,以对羟基苯甲酸丁酯为内标物,用带有负离子电喷雾的LC/MS/MS定量分析侧流烟气中8种挥发性羰基化合物。实验证明,此方法有较好的重复性:对8种羰基化合物测定的相对标准偏差在6%以下;具有较高的灵敏度:8种挥发性羰基化合物的检出限均低于2.8 ng/ cig;较高的准确性:8种挥发性羰基化合物的回收率在87.2%～104.7%之间。与以往的分析方法相比,该方法具有更高的选择性,实现了烟气中巴豆醛、2-丁酮的DNPH衍生物的同分异构体的分离,对巴豆醛、2-丁酮定量更为准确,分析方法的灵敏度也明显提高。      

工程制图新课程体系教材及教学改革实践

讲述了《工程制图》教材改革的必要性、紧迫性,提出了《工程制图》教材改革的原则和方向。重点阐述了对《工程制图》教材改革的制定与实施,以及为适应教材的改革和工程图学发展的需要,提出了对《工程制图》教学方法和手段的改革和建议。     

PET/ECDP/PEG共混纤维的纤度与性能关系研究

主要研究了聚对苯二甲酸乙二醇酯/阳离子易染聚对苯二甲酸乙二醇酯/聚乙二醇(PET/ECDP/PEG)共混纤维的纤度与力学性能、吸湿性能、抗静电性能和染色性能的关系,同时也对不同纤度PET/ECDP/PEG纤维的碱减量进行了研究。     

Detection of 20 phthalate esters in breast milk by GC-MS/MS using QuEChERS extraction method

ABSTRACT

A detection method for 20 different phthalate esters (PAEs) in breast milk analyzed by quick, easy, cheap, effective, rugged, and safe (QuEChERS) clean-up with five internal standards and quantitative GC–MS/MS was established. This method can effectively remove interfering substances such as lipids and fatty acids from breast milk using acetonitrile as the extraction solvent and PSA/C18 as clean-up materials. The 20 PAEs had a linear range of 5.0–500.0 µg/L and recoveries of 83.3–123.3% with RSDs of 0.2–7.6% (n = 6). The method detection limits (LODs) were 0.004–1.3 µg/kg. Dimethyl phthalate (DMP), Diethyl phthalate (DEP), Diisobutyl phthalate (DIBP), Di-n-butyl phthalate (DBP) and bis(2-ethylhexyl) phthalate (DEHP) were detected in the 35 breast milk samples, with median levels of 1.2, 6.8, 7.3, 32.9 and 13.6 μg/kg, respectively, and the concentrations of 20 PAEs ranged between 0.5 and 137.3 μg/kg. This is a fast, simple, sensitive and accurate method for the detection of 20 PAEs in breast milk or dairy products.     

PET/ECDP/PEG共混纤维的纤度与性能关系研究

主要研究了PET/ECDP/PEG共混纤维的纤度与力学性能.吸湿性能、抗静电性能和染色性能间的关系,同时也对不同纤度PET/ECDP/PEG纤维的碱减量过程进行了研究.随着共混纤维细度变细,拉伸强度和初始模量增大,断裂伸长率降低,抗静电性能提高,染色性能提高,纤维的碱减量率增大.     

食品中苏丹红的HPLC/DAD/MS分离分析方法研究

本实验研究了一种针对食品中非法添加苏丹红的分析方法,采用固相萃取技术对样品进行前处理,然后用HPLC 对苏丹红样品进行分离,DAD 和MS 进行串联检测。提高了分析检测的准确性、可靠性。本方法灵敏度高,具有较高且稳定的回收率,精密度较好。分析应用结果令人满意。